Add English translations for all 379 recipe and tip files

Use dotlang AI translation (aiursoft-instruct:latest via Ollama) to
translate all Chinese content to English under en/ subfolder:
- en/dishes/: all recipe categories (aquatic, breakfast, condiment,
  dessert, drink, meat_dish, semi-finished, soup, staple, vegetable_dish)
- en/tips/: learn/ and advanced/ cooking guides
- en/README.md, en/CONTRIBUTING.md, en/CODE_OF_CONDUCT.md

The mkdocs-static-i18n plugin (docs_structure: folder) serves Chinese
at the root and English at /en/, with a language switcher in the UI.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

en/dishes/condiment/油酥.md

@@ -0,0 +1,27 @@
+# How to Make You Su (Oil Pastry)
+
+You Su is made by mixing flour with hot oil. Applying a layer of You Su when pan-frying flatbreads helps create distinct layers, resulting in a crispy exterior and a soft interior for a better texture.
+
+Estimated Cooking Difficulty: ★★
+
+## Essential Ingredients and Tools
+
+- Flour
+- Oil
+- Salt
+
+## Measurements
+
+- Oil = (Number of flatbreads * 10 ml)
+- Salt = (Number of flatbreads / 2) g
+- Flour = (Number of flatbreads / 0.13) g
+
+## Instructions
+
+- Place the flour in a small bowl and add the salt.
+- Pour in 200°C hot oil.
+- Stir with chopsticks until a smooth, lump-free paste forms.
+
+## Additional Notes
+
+If you encounter any issues or have suggestions for improvement while following this guide, please submit an Issue or Pull Request.